This package provides an interface to Saxon tracing and debugging capabilities.

The package was originally created by Edwin Glaser.

The package includes three tracing modules that can be optionally selected: XSLTTraceListener, XQueryTraceListener, and TimedTraceListener. These all receive notification of the same events, but select and format the events in different ways to meet different requirements. Other events are notified through the TraceListener interface that are ignored by tracing applications, but may be of interest to debuggers.